Erratum to: How Big Is a Lock Number?
Correction to:Journal of the American Helicopter Society, Vol. 66, (1), January 2021, pp. 1–3, DOI 10.4050/JAHS.66.012001
Correction to:Journal of the American Helicopter Society, Vol. 66, (1), January 2021, pp. 1–3, DOI 10.4050/JAHS.66.012001